三维光弹试验自动测量、采集、处理系统

本文介绍了一种可供工程上应用的三维光弹自动测量、数据采集和处理系统。该系统经典型平面试验的验证。可以满足工程需要。还介绍了一个工程实例。本文对该系统的基本原理及有关的专题:401型光弹仪的旋转偏振锥光系统的原理、全场斜射仪、四自由度旋转台、光学系统的特殊要求、实验数据的计算机处理等作了专门介绍,最后对该系统的精度进行了讨论。     

热处理对大直径PPS单丝力学性能的影响

为了研究聚苯硫醚(PPS)单丝高温环境下的使用性能,选择直径为0.2,0.4,0.6,0.8 mm的大直径PPS单丝,在一定的温度与时间下进行热处理,研究了PPS单丝的结构及热处理条件对其力学性能的影响。结果表明:PPS分子结构中具有耐热的苯环结构,PPS单丝的熔点为282.4℃,在500℃以下无质量损失,在550℃左右质量损失率最大;对于较小直径(0.2 mm)的PPS单丝,当热处理温度低于200℃时,PPS单丝的断裂强度没有变化,在220℃条件下连续使用60 min,PPS单丝断裂强度下降1.4%,但不影响其使用性能;对于较大直径(0.4,0.6,0.8 mm)的PPS单丝,在热处理时间72 h条件下,当热处理温度为220℃时,3种PPS单丝的断裂强度保持率均在90%以上,在热处理温度220℃条件下,当热处理时间低于100 h时,PPS单丝断裂强度无损失,而热处理时间超过100 h后,PPS单丝断裂强度下降明显;较大直径PPS单丝连续使用环境温度应不超过220℃,在220℃条件下连续使用时间应尽量低于100 h。     

等离子体法炭黑工艺与炉法炭黑工艺的(火用)对比分析

传统炭黑生产过程热能效率低,存在大量NO_x和CO₂排放,炭黑收率低。等离子体法生产炭黑能大幅提高能量利用效率,理想状况下可以完全收获原料中的碳,并消除由于燃烧产生的CO₂和NO_x排放。基于Aspen Plus软件模拟了炉法炭黑和等离子体法炭黑工艺过程。计算分析了等离子体法炭黑工艺相对于炉法炭黑工艺的节能效果：对于炉法炭黑分别计算了N110、N₂20、N330、N440和N550五种炭黑品种的过程(火用)流,等离子体法炭黑计算了甲烷和焦油两种原料的过程(火用)流;对比分析了两种工艺过程炭黑收率、进出料(火用)流、产品(火用)效率以及工艺过程(火用)效率。结果表明：以焦油为原料的炉法炭黑收率在47.6%～66.6%之间,与实际值吻合,明显低于等离子体法94%的理想炭黑收率;以焦油为原料的理论计算表明,等离子体法炭黑产品(火用)效率和工艺过程(火用)效率显著高于炉法炭黑;以焦油为原料的等离子体法炭黑产品(火用)效率高于以甲烷为原料的产品(火用)效率。     

Web模式物资设备管理系统设计与应用

针对目前油田物资设备管理存在的问题,利用计算机网络和数据库技术,用ASP技术成功开发B/S结构的塔河油田某输气队物资设备管理系统。实现了信息的共享和分布式管理,提高了设备利用率。     

Two-dimensional self-consistent numerical simulation of the whole discharge region in an atmospheric argon arc

A 2D self-consistent numerical model of the whole argon-arc discharge region that includes electrodes is developed in this work to facilitate analysis of the physical processes occurring in atmospheric arc plasma. The 2D arc column model contains the ionization and thermal non-equilibrium, which is coupled with a 1D electrode sheath model. The influence of plasma-species diffusion near the electrode region is investigated based on Maxwell–Stefan equations and the generalized Ohm's law. The numerical results of argon free-burning arcs at atmospheric pressure are then investigated. The simulation shows that the plasma is obviously in the state of thermal and ionization equilibrium in the arc core region, while it deviates from thermal and ionization equilibrium in the arc fringe region. The actual electron density decreases rapidly in the near-anode and near-cathode regions due to non-equilibrium ionization, resulting in a large electron number gradient in these regions. The results indicate that electron diffusion has an important role in the near-cathode and near-anode regions. When the anode arc root gradually contracts, it is easy to obtain a positive voltage drop of the anode sheath (I = 50 A), while it remains difficult to acquire a positive anode sheath voltage drop (I = 150 A). The current–voltage characteristics predicted by our model are found to be identical to the experimental values.     

国外期刊论文简介

JournalofConstructionalSteelResearch对无支撑组合梁的组合节点的应用之评价M .P .Byfield,M .Dhanalakshmi,G .H .Couchman(英国 )文章在参数研究结果的基础上 ,评价了在何种条件下无支撑组合梁的组合节点可以安全地使用。根据不同级别的钢和荷载状况 ,考虑了总共 2 160种形态的梁。发现影响节点所需转动能力的关键因素是在梁中产生的恒荷载的应力水平 ,而不是混凝土的硬化 ,因为前者对于梁的变形有很大的影响。同时 ,文章还评价了诸多其它因素 ,包括 :跨高比、在房屋构架中的位置、支座和跨中弯矩之比、荷载类型、钢材的级别和在设…     

Axial Magnetic Field Effects on Xenon Short-Arc Lamps

The effect of an axial magnetic field （AMF） on an old xenon short-arc lamp is experimentally investigated in this work. As the AMF increases up to 18 roT, the visible radiation power and electric power ascend more than 80% and 70% respectively, and the radiation efficiency is improved by 23% for the best increment at 12 mT AMF. The measurement of radiation intensity shows that the increment of radiation intensity comes mostly from the plasma area close to the cathode tip, and partially from the other area of the arc column. Successive images of the arc indicate that the arc column not only rotates about its axis, but revolves around the axis of electrodes with the AMF. The arc column structure is constricted, distorted and elongated as the AMF increases. It is suggested that the improvements of the radiation intensity and radiation efficiency are attributed to the constriction of the arc column, which is mainly induced by the enhanced cathode jet.     

浅议代储代销的实施与管理

代储代销是中国石油天然气集团公司物资采购工作的重要组成部分。本文探讨了代储代销的内涵和分类,简要介绍了中国石油代储代销的基本概况,针对中国石油代储代销目前存在的若干问题提出了相关建议,并指出了未来开展代储代销应注意的几项重点工作。